Home |
Search |
Today's Posts |
|
#1
|
|||
|
|||
High data rate space transmissions through visible light communication.
Robert Clark wrote:
I had been thinking about methods of high data rate transmission in regards to getting *video* transmissions from Mars orbiter missions. I was irritated by the spotty coverage of the Mars surface at the best resolutions so I wanted to send real-time *continuous* imaging back to Earth receiving stations at the highest imaging resolutions. This would require very high transmission rates, much higher than what is currently used. The idea would be to use light transmissions but only of the on-off variety. You would use a large surface, many meters across, capable of Bob, You might not want to cross-post to 5 groups. 1) what spotty coverage? I doubt any gaps are due to the lack of data bandwidth from Mars to Earth, except when MRO goes behind Mars, or similar line of sight interruptions. There's a non-zero cost to running DSN antennas, too. In any case, getting sufficient bandwidth in a pipe to earth isn't a matter of technology, it's a matter of money. 2) Optical comm with very high bandwidths is a subject of research and development at NASA (at JPL) and the USAF (at Lincoln Labs). Lots of interesting ideas for receivers on the Earth, etc. Doesn't take a huge telescope or high powers at either end. They use, IIRC, a form of pulse position modulation. There was a special issue of IEEE Proceedings October 2007 (Special issue on Technical Advances in Deep-Space Communications and Tracking) that discusses a lot of this stuff. (including optical) Read it and learn, rather than just looking at press releases and formulating ideas from that. |
#2
|
|||
|
|||
High data rate space transmissions through visible lightcommunication.
On Jun 29, 11:42*am, Jim Lux wrote:
... * There was a special issue of IEEE Proceedings October 2007 *(Special issue on Technical Advances in Deep-Space Communications and Tracking) that discusses a lot of this stuff. (including optical) Read it and learn, rather than just looking at press releases and formulating ideas from that. And also picking the brains of people on these forums. Bob Clark ;-) |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Detecting Ultrasound | Homebrew | |||
Free guide on how to make your website rank high in Yahoo, Google, MSN... | Policy | |||
Free guide on how to make your website rank high in Yahoo, Google, MSN... | Equipment | |||
Detecting corrupt wav files? | Broadcasting |